WASHINGTON -- Leaders of the National Rifle Association on Thursday accused gun control advocates of exploiting the deadly Florida school shooting, striking a defiant tone amid a renewed debate over guns and school safety.

NRA Executive Vice-President Wayne LaPierre, in his first public comments since the shooting in Parkland, Florida, said NRA members mourn for the Florida victims but at the same time issued a searing indictment of opponents of gun rights for attempting to "exploit tragedy for political gain."

Vice President of the NRA Wayne LaPierre speaks during CPAC 2018 February 22, 2018 in National Harbor, Maryland. (Photo by Alex Wong/Getty Images)

"They hate the NRA. They hate the Second Amendment. They hate individual freedom," LaPierre said at the Conservative Political Action Conference in Oxon Hill, Maryland, near the nation's capital.

LaPierre addressed the conservative activists shortly before President Donald Trump held a listening session with state and local leaders on gun safety at the White House.

Today, it was my great honor to host a School Safety Roundtable at the @WhiteHouse with State and local leaders, law enforcement officers, and education officials.

There is nothing more important than protecting our children. They deserve to be safe, and we will deliver! pic.twitter.com/WhC2AxgWXO

The president said he had spoken to NRA leaders and expressed optimism that the nation's most prominent gun-owners organization would support his calls for raising the federal minimum age for buying or possessing certain weapons, enhancing background checks, addressing mental illness and banning the sale of bump stock devices.

NRA leaders did not address whether the federal government should raise the age limit for young adults to buy weapons. A day earlier, the organization issued a statement saying it opposes raising the age limit.

"Evil walks among us and God help us if we don't harden our schools and protect our kids," LaPierre said. "The whole idea from some of our opponents that armed security makes us less safe is completely ridiculous."

"Many in legacy media love mass shootings, you guys love it. Now I'm not saying that you love the tragedy but I am saying that you love the ratings. Crying white mothers are ratings gold." - Dana Loesch, NRA spokesman

LaPierre said Democrats such as House minority leader Nancy Pelosi of California and Sen. Chris Murphy of Connecticut were eagerly blaming the NRA. He also assailed the FBI for failing to follow up on warnings about the school shooter.

"Their solution is to make you, all of you, less free," LaPierre said of gun control advocates. "They want to sweep right under the carpet the failure of school security, the failure of family, the failure of America's mental health system, and even the unbelievable failure of the FBI."

The longtime face of the NRA was preceded on stage by the group's spokeswoman, Dana Loesch, a prominent conservative radio host. She accused media outlets of focusing heavily on school shootings involving white and affluent neighbourhoods instead of those occurring in inner cities.

"Many in legacy media love mass shootings, you guys love it," Loesch said. "Now I'm not saying that you love the tragedy but I am saying that you love the ratings. Crying white mothers are ratings gold."